Auto-scoll (middle mouse button) gone in Firefox 20/Windows 7 64-bit

I recently upgraded both my work PC and my home PC to Firefox 20.0.1. My work PC (Win XP 32-bit) works fine, but my home PC (Win 7 64-bit) no longer allows me to auto-scroll when I click the middle mouse button (it does nothing). I have tried restarting Firefox with all addons disabled, as well as a totally fresh install, but haven't had any luck. To clarify, the mouse wheel itself still works as it should, it's just clicking it in to auto-scroll that's the problem. I have confirmed that 'Use Autoscrolling' is set under Options>Advanced on both computers.
Has anyone else experienced this?

Did you check the setting?
*Tools > Options > Advanced > General: Browsing: "Use autoscrolling"
Start Firefox in <u>[[Safe Mode|Safe Mode]]</u> to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
*Do NOT click the Reset button on the Safe Mode start window or otherwise make changes.
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

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    duplicate of [/questions/956896]
    I recently upgraded both my work PC and my home PC to Firefox 20.0.1. My work PC (Win XP 32-bit) works fine, but my home PC (Win 7 64-bit) no longer allows me to auto-scroll when I click the middle mouse button (it does nothing). I have tried restarting Firefox with all addons disabled, as well as a totally fresh install, but haven't had any luck. To clarify, the mouse wheel itself still works as it should, it's just clicking it in to auto-scroll that's the problem.
    Has anyone else experienced this?
    ##EDIT##
    Please delete this (double post)

    Did you check the setting?
    *Tools > Options > Advanced > General: Browsing: "Use autoscrolling"
    Start Firefox in <u>[[Safe Mode|Safe Mode]]</u> to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
    *Do NOT click the Reset button on the Safe Mode start window or otherwise make changes.
    *https://support.mozilla.org/kb/Safe+Mode
    *https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

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